Download Intel® Edison Kit for Arduino* Hardware Guide

Intel® Edison Kit for Arduino*
Hardware Guide
February 2015
Revision 007
Document Number: 331191-007
Notice: This document contains information on products in the design phase of development. The information here is subject to change without
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Intel® Edison Kit for Arduino*
Hardware Guide
2
February 2015
Document Number: 331191-007
Contents
1
2
3
4
5
6
7
8
9
10
11
Introduction ....................................................................................................................................................................... 6
1.1
Software requirements ............................................................................................................................................................... 6
1.2
Terminology .................................................................................................................................................................................... 6
1.3
References ........................................................................................................................................................................................ 6
Product Overview ............................................................................................................................................................. 7
2.1
Shield pin GPIO mapping .......................................................................................................................................................... 8
2.2
Pin function multiplexing control (summary) .................................................................................................................. 9
2.3
Pin function multiplexing control (detailed) .................................................................................................................. 10
2.4
GPIO interrupt support............................................................................................................................................................ 11
2.5
Miscellaneous GPIOs ............................................................................................................................................................... 11
2.6
Pin direction and pullup control ......................................................................................................................................... 12
High-Level Functional Description ............................................................................................................................. 13
3.1
Intel® Edison kit for Arduino* header signal list ........................................................................................................... 14
3.2
Intel® Edison kit for Arduino* PWM swizzler ................................................................................................................. 15
3.3
Intel® Edison kit for Arduino* analog inputs .................................................................................................................. 16
3.4
Intel® Edison kit for Arduino* signal pullup resistors ................................................................................................ 16
3.5
Intel® Edison kit for Arduino* USB interface .................................................................................................................. 16
3.6
Intel® Edison kit for Arduino* power supply .................................................................................................................. 17
3.7
Intel® Edison kit for Arduino* expansion mechanicals ............................................................................................. 17
Powering the Intel® Edison kit for Arduino*................................................................................................................ 18
4.1
Boot voltage selection – DCIN signal ................................................................................................................................ 19
Batteries ............................................................................................................................................................................ 20
Layout................................................................................................................................................................................ 21
6.1
Antenna keepout ........................................................................................................................................................................ 21
6.2
Layout SD card, I2S, SPI, I2C ................................................................................................................................................. 21
6.3
LEDs.................................................................................................................................................................................................. 21
Handling ........................................................................................................................................................................... 22
Debug UART and Low-Power Sleep Mode ................................................................................................................ 23
Buttons .............................................................................................................................................................................. 24
9.1
FWR_RCVR and RCVR_MODE .............................................................................................................................................. 24
Digikey sources ............................................................................................................................................................... 25
Shield pin configuration ............................................................................................................................................... 26
11.1
Configure IO5 as a GPIO input, with pullup resistor disabled ............................................................................... 26
11.2
Configure IO11 as a GPIO input, with pullup resistor disabled ............................................................................ 27
11.3
Configure IO7 as a GPIO input, with pullup resistor enabled ........................................................................... 27
11.4
Configure IO6 as a PWM output........................................................................................................................................ 28
11.5
Configure IO14 as an ADC input ....................................................................................................................................... 28
11.6
Configure IO18/IO19 for I2C connectivity ..................................................................................................................... 29
11.7
Configure IO10 through IO13 for SPI connectivity .................................................................................................. 30
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
3
Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Arduino* Uno* pinout ............................................................................................................................................................. 7
Intel® Edison kit for Arduino* block diagram ............................................................................................................ 13
Intel® Edison kit for Arduino* PWM swizzler ............................................................................................................ 15
PWM swizzler on the Intel® Edison kit for Arduino* .............................................................................................. 16
Intel® Edison kit for Arduino* mechanical dimensions ........................................................................................ 17
Intel® Edison kit for Arduino* power distribution network ................................................................................ 18
Area around antenna ........................................................................................................................................................... 21
Inserting an Intel® Edison compute module ............................................................................................................. 22
Digikey sources....................................................................................................................................................................... 25
Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Product-specific documents ............................................................................................................................................... 6
Shield pin GPIO mapping ................................................................................................................................................... 8
Arduino* pin mux and pin mode settings ..................................................................................................................... 9
Pin function multiplexing control .................................................................................................................................. 10
GPIO interrupt support ....................................................................................................................................................... 11
Miscellaneous GPIOs ......................................................................................................................................................... 11
Pin direction and pullup control ................................................................................................................................. 12
Intel® Edison kit for Arduino* header signal list ...................................................................................................... 14
Intel® Edison kit for Arduino* PWM swizzler signal assignments ................................................................... 15
Layout SD card........................................................................................................................................................................ 21
Intel® Edison Kit for Arduino*
Hardware Guide
4
February 2015
Document Number: 331191-007
Revision History
Revision
Description
Date
ww32
Initial release
August 4, 2014
ww34
Minor edits.
August 20, 2014
ww36
Removed a column from Table 2.
September 5, 2014
001
First public release.
September 9, 2014
002
Minor corrections.
September 15, 2014
003
Added product overview chapter and shield pin configuration chapter.
September 18, 2014
004
Updated sections on software recovery mode, pin function mux controls, and LEDs.
December 1, 2014
005
Reversed high-low sequence of gpio214 in shield pin configuration section.
December 11, 2014
006
Minor corrections.
January 30,2015
007
Minor corrections.
February 5, 2015
§
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
5
Shield pin configuration
1
Introduction
This document describes the hardware interface of the Intel® Edison kit for Arduino*.
The kit contains external input/output pin connections which may be configured to be used in a variety of
interfacing modes, such as GPIO, PWM, SPI, I2C, ADC, for compatibility with Arduino* Uno* shield hardware. This
document describes the pin functions available, detailed GPIO pin mapping for pin control and I/O, and use of
Linux command line tools to configure the external I/O pin functions correctly for the desired mode of operation.
1.1
Software requirements
•
Intel® Edison kernel and BSP.
•
Access to the Linux command line on an Intel® Edison compute module.
1.2
Terminology
Term
Definition
PWM
Pulse width modulation
GPIO
General purpose input/output
ADC
Analog to digital converter
SPI
Serial peripheral interface
2
IC
1.3
Table 1
Inter-integrated circuit
References
Product-specific documents
Reference
Name
331188
Intel® Edison Board Support Package User Guide
Number/location
331189
Intel® Edison Compute Module Hardware Guide
331190
Intel® Edison Breakout Board Hardware Guide
331191
Intel® Edison Kit for Arduino* Hardware Guide
331192
Intel® Edison Native Application Guide
329686
Intel® Galileo and Intel® Edison Release Notes
[GSG]
Intel® Edison Getting Started Guide
331438
Intel® Edison Wi-Fi Guide
331704
Intel® Edison Bluetooth* Guide
(This document)
W: http://www.intel.com/support/edison/sb/CS-035336.htm
M: http://www.intel.com/support/edison/sb/CS-035344.htm
L: http://www.intel.com/support/edison/sb/CS-035335.htm
§
Intel® Edison Kit for Arduino*
Hardware Guide
6
February 2015
Document Number: 331191-007
Shield pin configuration
2
Product Overview
The 20 Arduino*-compatible shield I/O pins on the Intel® Edison kit for Arduino* are numbered IO0-IO19 (Figure 1).
All pins support basic GPIO functionality. Some of the pins also support PWM, ADC, SPI or I2C functions. Selection
of different pin functions on the Intel® Edison kit for Arduino* is achieved through use of SoC pin control interfaces
and GPIO output signals dedicated for multiplexing control. The following sections detail the mapping of each of
the GPIO pins available on the Intel® Edison compute module to their respective functions, which can be broadly
categorized as follows (see Figure 1):
•
External GPIO. Used for digital input/output signaling via the external shield pins.
•
Pin multiplexing control. Used for selecting different functions available on a given shield pin.
•
Pin buffer (level-shifter) direction control. Used to configure the buffer on a given shield pin for input or
output.
•
Pin pullup resistor control. Used to enable/disable a pullup resistor on a given shield pin.
To use any of the supported functions on a shield pin, it is first necessary to configure the multiplexing, buffer
direction, and pullup resistor controls applicable to that pin.
Figure 1
Arduino* Uno* pinout
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
7
Shield pin configuration
2.1
Shield pin GPIO mapping
Table 2 describes the mapping of GPIO and PWM pin numbers (in Linux) to shield I/O pins. The following details
are included:
•
Shield pin. Digital I/O pin number as per Arduino* Uno* pin numbering scheme.
•
GPIO (Linux). The pin number assigned under Linux.
•
Muxed functions. Other signals available on this shield pin, as they appear on the schematic.
Table 2
Shield pin GPIO mapping
Shield pin
GPIO (Linux)
IO0
130
PWM (Linux)
UART1_RXD
IO1
131
UART1_TXD
IO2
128
UART1_CTS
Note 1.
PWM0
Note 2.
IO3
12
IO4
129
IO5
13
IO6
182
IO7
48
IO8
49
IO9
183
3
PWM3
IO10
41
??
SPI_2_SS1
IO11
43
0
Muxed functions
Notes
UART1_RTS
Note 1.
1
PWM1
Note 2.
2
PWM2
Note 2.
─
─
??
Note 2.
I2S_2_FS
Note 1.
PWM4_OUT
Note 2.
SPI_2_TXD
I2S_2_TXD
Note 1.
PWM5_OUT
Note 2.
IO12
42
SPI_2_RXD
IO13
40
IO14
44
AIN0
IO15
45
AIN1
IO16
46
AIN2
IO17
47
AIN3
IO18
14
I2S_2_RXD
Note 1.
SPI_2_CLK
I2S_2_CLK
Note 1.
AIN4
I2C_6_SDA
IO19
1
2
165
AIN5
I2C_6_SCL
Some additional functions are available on certain SoC pins, such as I2S and UART flow control, but they are not currently
supported by the Arduino library. However, it may be possible to use these from Linux.
Depends on PWM swizzler. The SoC offers only four PWM pins. A jumper pin matrix labeled “PWM swizzler” on the baseboard
allows these four pins to be connected to any subset of the six shield-header pins normally used for PWM. From the factory,
IO3, IO5, IO6, and IO9 will be connected to the four available SoC PWM pins as described above. You can manually alter
these to connect IO10 or IO11.
Intel® Edison Kit for Arduino*
Hardware Guide
8
February 2015
Document Number: 331191-007
Shield pin configuration
2.2
Pin function multiplexing control (summary)
All GPIO pins on the Arduino* header require some internal GPIOs to be set up before the pin is usable. This is
usually as simple as setting an output enable, pullup enable, and mode. However, some pins have extra
functionality such as SPI, PWM, or I2C, so these pins need extra multiplexing (muxing) in order to be usable.
Table 3 shows this such that a programmer can easily see all the muxing pins affected for a given Arduino* header
pin. The color codes in the table show related boxes. For example, the blue boxes are meant to show the
relationship between the pin mux pins and the pin modes. This table is a synopsis of the more detailed tables
below, which contain extra information, such as schematic pin numbers. For most needs, this synopsized table
should suffice.
Table 3
Arduino* pin mux and pin mode settings
Linux
GPIO
pin Linux pin
GPIO pin mux
0 (low)
SoC pin modes
1 (high)
Output enable
(high = output)
Pullup
enable
0
1
Linux
Linux
IO0
130
GPIO
UART
248
216
IO0
130
GPIO
UART
248
216
IO1
131
GPIO
UART
249
217
IO2
128
GPIO
UART
250
218
IO3
12
GPIO
PWM
251
219
IO4
129
GPIO
UART
252
220
IO5
13
GPIO
PWM
253
221
IO6
182
GPIO
PWM
254
222
IO7
48
GPIO
255
223
IO8
49
GPIO
256
224
IO9
183
GPIO
PWM
257
225
IO10
41
GPIO
I2S or SPI
258
226
IO11
43
GPIO
I2S or SPI
259
227
263
PWM
see 240
240
GPIO or I2S
GPIO or SPI_FS
262
PWM
see 241
241
GPIO or I2S
GPIO or SPI TXD
IO12
42
242
GPIO or I2S
GPIO or SPI RXD
GPIO
I2S or SPI
260
228
IO13
40
243
GPIO or I2S
GPIO or SPI CLK
GPIO
I2S or SPI
261
229
IO14 (A0)
44
200
GPIO
A0
GPIO
232
208
IO15 (A1)
45
201
GPIO
A1
GPIO
233
209
IO16 (A2)
46
202
GPIO
A2
GPIO
234
210
IO17 (A3)
47
203
GPIO
A3
GPIO
235
211
IO18 (A4)
14
204
GPIO or I2C SDA
A4
GPIO
I2C-6
236
212
IO19 (A5)
165
205
GPIO or I2C SCL
A5
GPIO
I2C-6
237
213
Note:
Before setting up any muxing, set pin 214 (TRI_STATE_ALL) to HIGH, make all of your changes, then set
pin 214 to LOW.
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
9
Shield pin configuration
2.3
Pin function multiplexing control (detailed)
Table 4 lists the GPIO outputs dedicated to pin multiplexing control. Different functions may be selected for
specific shield I/O pins by setting these GPIO outputs to 0/1 (low/high). Additionally, some of the SoC GPIO pins
also feature internal mux options. These are listed as “SoC Pin Modes”.
Currently, these are configured by setting the required pin mode for the corresponding SoC GPIO pin N, via
/sys/kernel/debug/gpio_debug/gpioN/current_pinmux, to “mode[0/1/2/...]”
Table 4
Pin function multiplexing control
Shiel
d pin
Pin
Pin
Linux
0
1
IO0
-
GP130
130
GPIO
UART
IO1
-
GP131
131
GPIO
UART
IO2
-
GP128
128
GPIO
UART
IO3
-
GP12
12
GPIO
PWM
IO4
-
GP129
129
GPIO
UART
IO5
-
GP13
13
GPIO
PWM
IO6
-
GP182
182
GPIO
PWM
IO7
-
GP48
48
GPIO
IO8
-
GP49
49
GPIO
IO9
-
GP183
183
GPIO
PWM
IO10
U34_ IO1.7
Pulled down input
GP41
41
GPIO
I2S
GPIO pin mux
Linux
263
0 (low)
PWM4_OUT
SoC pin modes
1 (high)
GP41
Power-on default
2
SSP5_FS_1
U16_ IO1.0
240
GP41
SSP5_FS_1
Pulled up input 1
GP111
111
GPIO
SPI
U34_ IO1.6
262
PWM5_OUT
GP43
Pulled down input
GP43
43
GPIO
I2S
GP115
115
GPIO
SPI
U16_ IO1.1
241
GP43
SSP5_TXD
Pulled up input 1
IO12
U16_ IO1.2
242
GP42
SSP5_RXD
Pulled up input 1
GP42
42
GPIO
I2S
GP114
114
GPIO
SPI
IO13
U16_ IO1.3
243
GP40
SSP5_CLK
Pulled up input 1
GP40
40
GPIO
I2S
GP109
109
GPIO
SPI
IO11
SSP5_TXD
IO14
U17_ IO0.0
200
GP44
A0
Pulled up input 1
GP44
44
GPIO
IO15
U17_ IO0.1
201
GP45
A1
Pulled up input 1
GP45
45
GPIO
1
IO16
U17_ IO0.2
202
GP46
A2
Pulled up input
GP46
46
GPIO
IO17
U17_ IO0.3
203
GP47
A3
Pulled up input 1
GP47
47
GPIO
IO18
U17_ IO0.4
204
GP14
A4
Pulled up input 1
GP14
14
GPIO
GP28
28
GPIO
GP165
165
GPIO
I2C6_SCL
IO19
1.
U17_ IO0.5
205
GP165
A5
Pulled up input 1
I2C-6
I2C-8
I2C-6
I2C-8
I2C6_SDA
GP27
27
GPIO
These pins are pulled up inputs at power-on. This effectively enables the mux switches (i.e. mux function 1 is selected).
Intel® Edison Kit for Arduino*
Hardware Guide
10
February 2015
Document Number: 331191-007
Shield pin configuration
2.4
GPIO interrupt support
All GPIO inputs on the Intel® Edison platform are interrupt-capable, and all interrupt types are supported on all
inputs. Table 5 lists the specific edge- and level-triggered interrupt types that are supported on each pin.
Table 5
GPIO interrupt support
Shield pin
1.
GPIO
Level-triggered 1
Edge-triggered
Linux
Rising
Falling
Both
Low
High
IO0
130
Y
Y
Y
Y
Y
IO1
131
Y
Y
Y
Y
Y
IO2
128
Y
Y
Y
Y
Y
IO3
12
Y
Y
Y
Y
Y
IO4
129
Y
Y
Y
Y
Y
IO5
13
Y
Y
Y
Y
Y
IO6
182
Y
Y
Y
Y
Y
IO7
48
Y
Y
Y
Y
Y
IO8
49
Y
Y
Y
Y
Y
IO9
183
Y
Y
Y
Y
Y
IO10
41
Y
Y
Y
Y
Y
IO11
43
Y
Y
Y
Y
Y
IO12
42
Y
Y
Y
Y
Y
IO13
40
Y
Y
Y
Y
Y
IO14
44
Y
Y
Y
Y
Y
IO15
45
Y
Y
Y
Y
Y
IO16
46
Y
Y
Y
Y
Y
IO17
47
Y
Y
Y
Y
Y
IO18
14
Y
Y
Y
Y
Y
IO19
165
Y
Y
Y
Y
Level-triggered interrupts are not supported by the Arduino* library, a limitation of the GPIO sysfs interface.
2.5
Y
Miscellaneous GPIOs
The GPIOs listed in Table 6 are used for other platform functions and for Arduino shield compatibility.
Table 6
Miscellaneous GPIOs
Function
GPIO pin
GPIO Linux
Direction
Power-on default 1
TRI_STATE_ALL
U17_IO1.6
214
Output
Pulled up input*
SHLD_RESET
U17_IO1.7
215
Output
Pulled up input*
Initial setup
SHLD_RESET
U17_IO0.7
207
Input
Pulled up input*
1
These pins are pulled up inputs at power-on. In this state, they have the same effect as outputs set high.
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
11
Shield pin configuration
2.6
Pin direction and pullup control
For most shield pins on the Intel® Edison kit for Arduino*, there is a buffer/level-shifter which needs to be
configured for input or output direction, and an external 47 kohm pullup/pulldown resistor, which may be
optionally enabled. Both are driven by dedicated GPIO outputs, listed in Table 7. When configuring a shield pin as
an output, we advise configuring the buffer for output before setting the SoC GPIO pin direction to output. To
disconnect the external pullup/pulldown resistors, it is necessary to configure as high-impedance inputs the GPIOs
that drive them.
Note also that the GPIO signals from the PCAL9555A GPIO expanders have internal 100 kohm pullup resistors,
which are connected to the GPIO pins by default. These need to be disabled in many cases, by configuring those
pins as high-impedance inputs.
Table 7
Pin direction and pullup control
Shield
pin
Output enable GPIO (high = output)
Pin
Linux
IO0
U34_ IO0.0
248
IO1
U34_ IO0.1
IO2
U34_ IO0.2
IO3
Pullup enable GPIO
Pin
Linux
Power-on default 2
Pulled-down input
U39_IO0.0
216
Pulled up input
249
Pulled-down input
U39_IO0.0
217
Pulled up input
250
Pulled-down input
U39_IO0.0
218
Pulled up input
U34_ IO0.3
251
Pulled-down input
U39_IO0.0
219
Pulled up input
IO4
U34_ IO0.4
252
Pulled-down input
U39_IO0.0
220
Pulled up input
IO5
U34_ IO0.5
253
Pulled-down input
U39_IO0.0
221
Pulled up input
IO6
U34_ IO0.6
254
Pulled-down input
U39_IO0.0
222
Pulled up input
IO7
U34_ IO0.7
255
Pulled-down input
U39_IO0.7
223
Pulled up input
IO8
U34_ IO1.0
256
Pulled-down input
U39_IO0.7
224
Pulled up input
IO9
U34_ IO1.1
257
Pulled-down input
U39_IO0.7
225
Pulled up input
IO10
U34_ IO1.2
258
Pulled-down input
U39_IO0.7
226
Pulled up input
IO11
U34_ IO1.3
259
Pulled-down input
U39_IO0.7
227
Pulled up input
IO12
U34_ IO1.4
260
Pulled-down input
U39_IO0.7
228
Pulled up input
IO13
U34_ IO1.5
261
Pulled-down input
U39_IO0.7
229
Pulled up input
IO14
U16_ IO0.0
232
Pulled-down input
U17_ IO1.0
208
Pulled up input
IO15
U16_ IO0.1
233
Pulled-down input
U17_ IO1.1
209
Pulled up input
IO16
U16_ IO0.2
234
Pulled-down input
U17_ IO1.2
210
Pulled up input
IO17
U16_ IO0.3
235
Pulled-down input
U17_ IO1.3
211
Pulled up input
IO18
U16_ IO0.4
236
Pulled-down input
U17_ IO1.4
212
Pulled up input
Power-on default
1
IO19
U16_ IO0.5
237
Pulled-down input
U17_ IO1.5
213
Pulled up input
1
These pins are externally pulled down inputs at power-on. This effectively selects input direction for level shifters.
2
These pins are internally pulled up inputs at power-on. This effectively enables pullups (as 100 kohm + 47 kohm in series).
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High-Level Functional Description
The Intel® Edison kit for Arduino*expansion board is designed to be hardware and software pin-compatible with
Arduino shields designed for the Uno R3. Digital pins 0 to 13 (and the adjacent AREF and GND pins), analog inputs
0 to 5, the power header, ICSP header, and the UART port pins (0 and 1) are all in the same locations as on the
Arduino Uno R3. This is also known as the Arduino 1.0 pinout. Additionally, the Intel® Edison kit for Arduino* board
includes a micro SD card connector, a micro USB device port connected to UART2, and a combination micro USB
device connector and dedicated standard size USB 2.0 host Type-A connector (selectable via a mechanical
microswitch).
Figure 2
Intel® Edison kit for Arduino* block diagram
ICSP
1
IOREF 2
RESET 3
3.3V 4
5V 5
GND 6
GND 7
VIN 8
7 to 15 V Brick
Power Supply
2 5V
4 ~IO11
6 GND
5V
VIN (7 to 15 V)
6
10 SCL
SPI
I2C
2
GPIO
SPI0
3
4
JUMPER
SLECTION
Port
Expander
Port
Expander
Intel® Edison
3
I2C
Level
Shifter
2
USB 0TG
UART 1
DIR &PULL UP
UART 2
UART – USB
FTDI
I2C
Host USB
Full size
Type-A
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Client
USB
Micro
Type-B
Client
USB
Micro
Type-B
Port
Expander
Port
Expander
USB MUX
Micro SD
Connector
8 IO7
7 ~IO6
6 ~IO5
5 IO4
4 ~IO3
3 IO2
2 TX 
1 RX 
Level Shifter
GPIO
SD
SDA
AREF
GND
IO13
IO12
~IO11
~IO10
~IO9
IO8
DIGITAL (PWM~)
DIR
2
SPI
FLAS
ADC
H
SEL &PULL UP
GPIO
MUX
FLASH
6
6
9
8
7
6
5
4
3
2
1
Level Shifter
Level Shifter
A0 1
A1 2
A2 3
A3 4
A4 5
A5 6
IO12 1
IO13 3
RESET 5
3.3V
MUX
FLASH
ANALOG IN
POWER
IOREF Jumper
selects 3.3 or 5 V
Shield Operation
3.3V <-> 5V Level
Translation provided
on board between
all Edison I/O and
Shield Headers
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3.1
Intel® Edison kit for Arduino* header signal list
The Intel® Edison kit for Arduino* digital signals can be configured as input or output. When programmed as an
input, a GPIO can serve as an interrupt. The Intel® Edison kit for Arduino* 1.8 V I/O are translated to 3.3 or 5 V using
SN74LVC1T45 dual supply bus transceivers with 3 state outputs. Both outputs go tristate if either supply rail is at
ground. The port direction is referenced to VCCA. The drive level for the transceiver is: ±4 mA at 1.8 V, ±24 mA at
3.3 V, and ±32 mA at 5 V.
Note:
Drive level at 1.8 V is for reference only – pertains to drive level towards the Intel® Edison compute module.
Table 8
Intel® Edison kit for Arduino* header signal list
Header
Arduino pin name Signal function
Power
N/C
Not connected
Power
IOREF
Shield I/O reference voltage (select 3.3 or 5 V via jumper on board)
Power
RESET
Shield reset (programmable via software or manual push button)
Power
3.3 V
System 3.3 V output
Power
5V
System 5 V output
Power
GND
Ground
Power
GND
Ground
Power
VIN
System input power (7 to 15 V)
Analog
A0
Analog input or digital I/O
Analog
A1
Analog input or digital I/O
Analog
A2
Analog input or digital I/O
Analog
A3
Analog input or digital I/O
Analog
A4 / SDA
Analog input, digital I/O, or I2C data (also connected to digital header)
Analog
A5 / SCL
Analog input, digital I/O, or I2C data (also connected to digital header)
Digital
SCL
I2C clock
Digital
SDA
I2C data
Digital
AREF
ADC reference voltage (select AREF or IOREF via jumper J8 on board)
Digital
GND
Ground
Digital
13 / SCK
Digital I/O, or SPI clock
Digital
12 / MISO
Digital I/O, or SPI receive data
Digital
~11 / MOSI
Digital I/O, SPI send data, or PWM (configured with PWM swizzler)
Digital
~10
Digital I/O, SPI signal select, or PWM (configured with PWM swizzler)
Digital
~9
Digital I/O, PWM (configured with PWM swizzler)
Digital
8
Digital I/O
Digital
7
Digital I/O
Digital
~6
Digital I/O, PWM (configured with PWM swizzler)
Digital
~5
Digital I/O, PWM (configured with PWM swizzler)
Digital
4
Digital I/O
Digital
~3
Digital I/O, PWM (configured with PWM swizzler)
Digital
2
Digital I/O
Digital
1 / TX 
Digital I/O
Digital
0 / RX 
Digital I/O
ICSP
MISO
SPI receive data (connected to digital pin 12)
ICSP
5V
System 5 V output
ICSP
SCK
SPI clock (connected to digital pin 13)
ICSP
MOSI
SPI send data (connected to digital pin 11)
ICSP
RESET
Shield reset (programmable via software or manual push button)
ICSP
GND
Ground
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3.2
Intel® Edison kit for Arduino* PWM swizzler
There are four available GPIO that can be configured as PWM outputs. The PWM features are:
•
The PWM Output Frequency and Duty Cycle can be estimated by the equations:
•
Target frequency ~= 19.2 MHz * Base_unit value / 256
•
Target PWM Duty Cycle ~= PWM_on_time_divisor / 256
The four PWM sources are wired to a PWM “swizzler”. This pin header arrangement allows the four PWM sources to
be routed to any four of the six Arduino header pins. Figure 3 shows the PWM swizzler.
Figure 3
Intel® Edison kit for Arduino* PWM swizzler
The four PWM sources from the Intel® Edison compute module (GP12_PWM0, GP13_PWM1, GP182_PWM2, and
GP183_PWM3) can be configured to drive four of the six Arduino* header PWMs. Each Intel® Edison kit for Arduino
PWM can be jumpered to one of three Arduino PWMs. For example, GP12_PWM0 can be jumpered to PWM0_OUT,
PWM2_OUT, or PWM1_OUT.
Note:
Moving the PWM jumpers from the default configuration makes an I/O pin unavailable for use.
Arduino* multiplexing has secondary multiplexing options of SPI (or GPIO). No other PWM has these secondary
multiplexing options. Therefore, if the four Intel® Edison compute module PWMs are used and are not connected to
the first four Arduino* PWM pins, then those unused pins of the first four pins cannot be used as a GPIO. They will
have any function; they cannot be inputs or outputs (Table 9).
Table 9
Intel® Edison kit for Arduino* PWM swizzler signal assignments
Digital pin
Uno
Uno
Edison I/O
11
IO
PWM(5)
GP43 (SSP2_TXD)
Edison PWM
PWM3
10
IO
PWM(4)
GP41 (SSP2_FS0)
PWM3, PWM2
9
IO
PWM(3)
GP183_PWM3
PWM3, PWM2, PWM1
6
IO
PWM(2)
GP182_PWM2
PWM2, PWM1, PWM0
5
IO
PWM(1)
GP13_PWM1
PWM1, PWM0
3
IO
PWM(0)
GP12_PWM0
PWM0
The factory default jumper configuration of Intel® Edison kit for Arduino* has digital pins 3, 5, 6, and 9 attached to
GPx_PWMx. These pins can be configured to be either a GPIO or a PWM output. The swizzler allows the four Intel®
Edison compute module PWMs to be mapped to the six Arduino* pins as shown in the last column of Table 9. For
example, if PWM0 is mapped to digital pin 5, then there is no Intel® Edison kit for Arduino* pin available to connect
to Digital pin 3. So this pin no longer has a function. If it is driven as an output, it will output high. If it is driven as an
input, the signal is lost in the swizzler.
The default configuration is DIG3 = GP12_PWM0, DIG5 = GP13_PWM1, DIG6 = GP182_PWM2, and DIG9 =
GP183_PWM3. This requires jumpers on J12 1-2, and J12 3-4, J11 1-2, and J11 3-4, as shown in Figure 4.
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Figure 4
3.3
PWM swizzler on the Intel® Edison kit for Arduino*
Intel® Edison kit for Arduino* analog inputs
The analog inputs are fed to an ADS7951 A/D converter. This device has the following features:
•
20 MHz clock rate
•
12-bit A/D conversion
•
1 MHz sample rate
•
70 dB signal to noise ratio
•
0 to 3.3 V or 0 to 5 V input range (select either AREF or IOREF via jumper J8 onboard)
The analog inputs are multiplexed with digital I/O using SN74LVC2G53 analog switches. These switches isolate the
digital I/O from the analog input to prevent crosstalk. The SN74LVC2G53 also has an inhibit pin that places the I/O
in a tristate condition. The switch also has low on state resistance of 15 ohm at 4.5 V VCC.
3.4
Intel® Edison kit for Arduino* signal pullup resistors
The analog and digital pins can be configured to have an external pull-up resistor connected. The pullup value is
fixed at 47 kohm.
3.5
Intel® Edison kit for Arduino* USB interface
The Intel® Edison compute module has a single USB 2.0 interface. This interface is the primary method for
downloading code. The Intel® Edison compute module is designed to support OTG, using the ID signal. Circuitry on
the Intel® Edison kit for Arduino* board uses a USB multiplexer, and an external switch to configure the USB
interface as a host port or device port. SW1 is a slider switch which selects between host mode and device mode.
When the slider is switched towards the USB standard size Type A connector, the Intel® Edison compute module
will go to host mode. When the switch is towards the micro USB Type B connector, the Intel® Edison compute
module will go to device mode.
Note:
USB host mode always requires use of an external power adapter.
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3.6
Intel® Edison kit for Arduino* power supply
The Intel® Edison compute module is a low power device. In general it will not draw more than 200 mA
(approximately 430 mA (final value TBD) when transmitting over Wi-Fi) from the main power source. Therefore, the
Intel® Edison kit for Arduino* may run on USB power (when configured as a device), or off an external power
adapter from 7 to 15 V.
Power from the external power adapter goes to a DC-DC converter and down converted to 5 V. The 5 V rail is
diode-ORed with the USB micro B VBUS rail. This power goes to a DC-DC converter which down converts the power
to 4.4 V. This voltage is in the safe range for the Intel® Edison compute module VSYS. The VSYS power range is
3.15 V min to 4.5 V max. This allows VSYS to run off a standard lithium ion battery.
The onboard charger IC is configured to detect the input power source and to limit the input power to either
500 mA (if connected to USB micro B port) or up to 1 A if connected to the DC power jack. The charger is
programmed to charge at 100 mA. This charger is designed to charge standard lithium ion batteries with 4.2 V
maximum charging voltage. End-users are responsible for choosing a suitable battery and following all safety
precautions, to assure overcharging or charging when the battery temperature is too high is avoided.
For low power applications (those shields running off 3.3 V) a lithium ion battery (3.0 to 4.3 Vmax) can be attached
to J2, which will power the Intel® Edison kit for Arduino and provide 100 mA of 3.3 V to the shield.
Some considerations of the power distribution in the Intel® Edison kit for Arduino*:
•
Due to the diode ORing of the 5 V DC/DC and the VBUS input, means the 5 V power to the shield header will
be nominally below 5 V. In the case of VBUS the voltage may be as low as 4.4 V (4.75 V VBUS min – 0.3 V
diode drop. In the case of external power adapter 4.7 V.
•
USB host mode always requires use of an external power adapter.
3.7
Intel® Edison kit for Arduino* expansion mechanicals
Figure 5 lists the dimensions (in thousands of inches and [mm]) of the Intel® Edison kit for Arduino* board.
Figure 5
Intel® Edison kit for Arduino* mechanical dimensions
DS3
DS1
DS2
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4
Powering the Intel® Edison kit for Arduino*
You can power the Intel® Edison kit for Arduino* using any of the following:
•
an external power supply on J1;
•
DCIN via shield header pin VIN;
•
a USB cable via micro USB connector J16; or
•
a lithium-ion battery connected to J2.
When power is applied to J1 or VIN, the external power must be in the range of 7 to 17 V. The power is converted
to 5 V via a switching power supply, which powers the rest of the system. This supply was designed for a 1 A
continuous supply. Higher currents will generate more power losses and may thermally damage the switcher. The
switcher does have internal short circuit protection, and thermal shutdown protection. The end-user should not
rely on thermal not short circuit protection.
Figure 6 shows the power distribution network of the Intel® Edison kit for Arduino*.
Figure 6
Intel® Edison kit for Arduino* power distribution network
Power from the 5 V switcher is diode-ORed with power from the USB connector. This arrangement allows the Intel®
Edison kit for Arduino* to run off external power or USB power. This rail is used to power the shields, the SD card
slot, and a 4.35 V switcher. The total current on this rail should be limited to 1 A maximum continuous.
The 4.35 V rail powers a battery charger and the Intel® Edison compute module. The 4.3 V supply is also designed
to generate 1 A, and has the same protections (thermal and short circuit) as the 5 V supply.
The charger is designed to only accept 1 A maximum from the 4.35 V rail, and will charge a battery at 100 mA. The
charger will supply power from the 4.35 V input or from the battery (if attached). The charger will charge the
battery (from the 4.35 V supply) autonomously using whatever power is left over from powering the Intel® Edison
kit for Arduino.
For low voltage systems, the Intel® Edison compute module can provide 3.3 V at 250 mA to the shields. The user
should limit the current from the Intel® Edison kit for Arduino* 3.3 V rail. Higher currents will cause the 3.3 V output
to droop (due to IR losses), and may cause excessive heating of the Intel® Edison compute module.
The Intel® Edison compute module is a low power device. It normally operates at 200 mA. During Wi-Fi transmit
bursts, the current could reach 600 mA for milliseconds. The sum of the Intel® Edison kit for Arduino* current,
recharging, SD card, and shield power could exceed the 500 mA specification. This could cause triggering of the
USB power switch within a PC, causing loss of USB functionality until the PC is restarted.
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Some considerations of the power distribution in the Intel® Edison kit for Arduino*:
•
There is a diode ORing of the 5 V DC/DC and the VBUS input. In the case of powering the Intel® Edison kit for
Arduino* from VBUS, the shield voltage may be as low as 4.4 V (4.75 V VBUS min – 0.3 V diode drop). In the
case of external power adapter, voltage to the shield will be 5 V ±2%.
•
Using the Intel® Edison compute module as a USB HOST requires use of an external adapter.
•
End-users are responsible for choosing a suitable battery and following all safety precautions, to prevent
overcharging or charging when the battery temperature is too high. The battery should be at least 200 mAH
capacity due to the 100 mA charging current. We recommend battery packs with internal protection circuits.
4.1
Boot voltage selection – DCIN signal
DCIN is a signal that indicates whether the Intel® Edison compute module is being powered from a battery or from
an external power source. DCIN also sets the voltage level required on VSYS in order to boot. When DCIN is floating
or tied to ground, the voltage on VSYS must rise from 2.5 to 3.5 V in 10 ms; otherwise the boot is aborted. When
the boot is aborted, power must be cycled below 2.5 V. If DCIN is connected to VSYS, the Intel® Edison compute
module will start to boot when VSYS is above 2.5 V for 100 ms.
Note:
Note:
When DCIN is connected to VSYS, boot will occur whenever the voltage is above 2.8 V for 100 ms. The
DCIN signal is attached to VSYS on the PCB.
The absolute minimum voltage to assure Wi-Fi and Bluetooth functionality is 3.15 V.
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5
Batteries
The rechargers chosen on the Intel® Edison kit for Arduino* and the Intel® Edison Breakout Board were designed for
lithium-ion or lithium-polymer batteries. Follow the manufacturer’s guidelines when charging batteries. Generally,
charging current should not exceed 50 to 70% of the rated capacity. For example, a 200 mAH battery should be
charged with 70% • 200 mA = (140 mA).
The Intel® Edison kit for Arduino* has a 100 mA charging current; the Intel® Edison Breakout Board has a 190 mA
charging current.
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6
Layout
6.1
Antenna keepout
The area under and around the antenna should be kept free of all components, routes, and ground plane. The
Intel® Edison compute module DXF in white with antenna keepout shown in the Arduino* trace layers. See Figure 7.
Figure 7
Area around antenna
6.2
Layout SD card, I2S, SPI, I2C
Table 10
Layout SD card
Signal parameter
Metric (mm)
Standard (mils)
Total length L1
0.254 to 101.6 mm
10 to 4000 mils
DATA/CMD/CTRL to CLK maximum pin-to-pin length mismatch
±2.54 mm
±100 mils
Minimum main route spacing ratio
60 × 60 µm. 1:1 trace width/space.
CLK to DATA/CMD/CTRL matching
±200 mils
Characteristic single-ended impedance
42 to 45 ohm (±10%)
Load capacitance
2 to 5 pF
Note:
6.3
For SPI, total length is 6000 mils; for I2C, total length is 8000 mils.
LEDs
The Intel® Edison kit for Arduino has three LEDs. (See Figure 5 for locations.)
•
DS1 is the reset LED. It will turn on when the Intel® Edison processor is running. When the processor is in
reset and asserting RESET_OUT# low, it will turn off.
•
DS2 is the standard LED on the Arduino* board. It runs using the ‘blink’ code or whenever Digital I/O 13 is
asserted High. It can be used as an indicator under direct control.
•
DS3 is the battery charging LED. It will turn on when the LTC4067 is charging an attached battery.
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7
Handling
When assembling an Intel® Edison compute module to an Arduino* board, handle the Intel® Edison compute
module by the PCB edges. Avoid holding or exerting pressure to the shields. To mate the Intel® Edison compute
module to the Arduino* board, apply pressure directly above the connector and to the left corner, as shown in
Figure 8.
Figure 8
Inserting an Intel® Edison compute module
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8
Debug UART and Low-Power Sleep Mode
When the Intel® Edison compute module goes into low-power sleep, the UART internal FIFO and interface is
powered down. Therefore, a two-wire UART (Rx/Tx) will lose the first received character whenever the Intel® Edison
compute module is in low-power sleep mode. In order to avoid this condition, when sleep mode is enabled, a fourwire UART (Rx, Tx, CTS, and RTS) is required.
Note:
Low-power sleep mode is disabled by default in the latest image. To address this, update your firmware as
explained in the Getting Started Guide at https://communities.intel.com/docs/DOC-23147.
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9
Buttons
This section explains the software functionality of the Intel® Edison kit for Arduino* buttons.
The Intel® Edison kit for Arduino* has the following buttons:
•
System reset. Pressing the system reset button (SW1UI5) will reset the Intel® Edison compute module, and
reset the I/O expanders, setting all the shield pins to high impedance state with no pullups.
•
Shield reset. Pressing the shield reset button (SW1UI1) will pull the shield signal reset to the active low
state. It does not affect the state of the Intel® Edison compute module or its I/O.
•
Power button. The power button (SW1UI2) is configured by software. Pressing and holding the power
button will produce different results depending on the current state of the Intel® Edison compute module
and the duration of the hold:
9.1
−
When the Intel® Edison device is completely powered down, pressing and holding the power button for
3 seconds will power up the device and boot up the Intel® Edison compute module.
−
When the Intel® Edison device is running, pressing and holding the power button for more than
2 seconds but less than 7 seconds will put the Intel® Edison device into AP (access point) mode. This
action enables the “one-time setup” (same as configure_edison --enableOneTimeSetup).
−
When the Intel® Edison device is running, pressing and holding the power button for 10 seconds or
more will cause the Intel® Edison compute module to power down. This is similar to a hard shutdown,
which cuts the power supply to the compute module.
FWR_RCVR and RCVR_MODE
SW1UI3 and SW1UI4 are for factory use only.
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10 Digikey sources
Figure 9 shows some third-party accessories you can use.
Figure 9
Digikey sources
Mating connector 2.0 mm
DF40C(2.0)-70DS-0.4V(51) - H11908CT-ND Cut tape
DF40C(2.0)-70DS-0.4V(51) H11908TR-ND
Mini-breakout power jack PJ-002BH-SMT-TR
CP-002BHPJCT-ND Cut tape
Tape and Reelt
PJ-002BH-SMT-TR CP-002BHPJTR-ND Tape and reel
Mini-breakout USB adapter cable
USB A female to Micro A male 10-00649 839-1105-ND
Mini-breakout male header
2x14 M20-9980745 952-1932-ND
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11 Shield pin configuration
This chapter will help you configure the Arduino* shield pins.
To configure the Arduino* shield pins, do the following:
1.
Identify the Arduino* shield pin number of the pin you want to use, in the range IO0-IO19.
2.
Identify the functions available for the given pin, and select the function you want to use. Typical functions
are GPIO, PWM, UART, I2C, SPI, ADC. Only some functions are available on each pin.
3.
Determine which GPIO signals, if any, need to be configured to select the correct pin muxing option for the
selected function. Some pins only have a single function, or do not require mux control.
4.
Determine which GPIO signals, if any, need to be configured to select the pin buffer direction for input or
output, and determine the direction that is required.
5.
Determine which GPIO signals, if any, need to be configured to select the pullup resistor control, and
whether the pullup resistor should be enabled or disabled. For most pin functions, the pullup resistors
should typically be disabled. For GPIO input functions, the pullup resistor may optionally be enabled or
disabled, according to your needs.
6.
Export the above GPIO numbers for access in the Linux user-space environment (from the command
shell).
7.
Configure the above GPIO numbers for output.
8.
Assert the TRI_STATE_ALL signal to disconnect the shield pins.
9.
Set the above GPIO numbers to assert their output logic levels as high or low.
10. Set the SoC GPIO pin mode for the required functionality.
11. Deassert the TRI_STATE_ALL signal to reconnect the shield pins.
11.1
Configure IO5 as a GPIO input, with pullup resistor disabled
To configure IO5 as a GPIO input, with pullup resistor disabled, do the following:
1.
Refer to Table 2 for the GPIO number. According to Table 2, the GPIO number for IO5 is 13.
2.
According to Table 4, GPIO 43 pin-mux must be set to mode0 to select the GPIO.
3.
According to Table 7, GPIO 253 must be set to 0 to disable the output direction for IO5.
4.
According to Table 7, GPIO 221 must be set as a high-impedance input to disable the external pullup
resistor for IO5.
5.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
13 > /sys/class/gpio/export
253 > /sys/class/gpio/export
221 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
low > /sys/class/gpio/gpio253/direction
in > /sys/class/gpio/gpio221/direction
mode0 > /sys/kernel/debug/gpio_debug/gpio13/current_pinmux
in > /sys/class/gpio/gpio13/direction
high > /sys/class/gpio/gpio214/direction
You should be able to use IO5 as a GPIO input. For example:
# cat /sys/class/gpio/gpio13/value
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11.2
Configure IO11 as a GPIO input, with pullup resistor disabled
To configure IO11 as a GPIO input, with pullup resistor disabled, do the following:
1.
Refer to Table 2 for the GPIO number. According to Table 2, the GPIO number for IO11 is 43.
2.
According to Table 4, GPIO 262 must be set to 1 to select GPIO/SPI, GPIO 241 must be set to 0 to select
GPIO, and GPIO 43 pin-mux must be set to ‘mode0’ to select GPIO.
3.
According to Table 7, GPIO 259 must be set to 0 to disable the output direction for IO11.
4.
According to Table 4, GPIO 227 must be set as a high-impedance input to disable the external pullup
resistor for IO5.
5.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
43 > /sys/class/gpio/export
262 > /sys/class/gpio/export
241 > /sys/class/gpio/export
259 > /sys/class/gpio/export
227 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
high > /sys/class/gpio/gpio262/direction
low > /sys/class/gpio/gpio241/direction
mode0 > /sys/kernel/debug/gpio_debug/gpio43/current_pinmux
low > /sys/class/gpio/gpio259/direction
in > /sys/class/gpio/gpio227/direction
in > /sys/class/gpio/gpio43/direction
high > /sys/class/gpio/gpio214/direction
You should be able to use IO11 as a GPIO input. For example:
# cat /sys/class/gpio/gpio43/value
11.3
Configure IO7 as a GPIO input, with pullup resistor enabled
To configure IO7 as a GPIO input, with pullup resistor enabled, do the following:
1.
Refer to Table 2 for the GPIO number. According to Table 2, the GPIO number for IO7 is 48.
2.
According to Table 7, GPIO 255 must be set to 0 to disable the output direction for IO7.
3.
According to Table 7, GPIO 223 must be set to output high to enable the external pullup resistor for IO7.
4.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
48 > /sys/class/gpio/export
255 > /sys/class/gpio/export
223 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
low > /sys/class/gpio/gpio255/direction
high > /sys/class/gpio/gpio223/direction
in > /sys/class/gpio/gpio48/direction
high > /sys/class/gpio/gpio214/direction
You should be able to use IO7 as a GPIO input. For example:
# cat /sys/class/gpio/gpio48/value
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Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
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Shield pin configuration
11.4
Configure IO6 as a PWM output
To configure IO6 as a PWM output, do the following:
1.
Refer to Table 2 for the GPIO number. According to Table 2, the GPIO number for IO6 is 182.
2.
According to Table 4, GPIO 182 pin-mux must be set to ‘mode1’ to select PWM.
3.
According to Table 7, GPIO 254 must be set to 1 to enable the output direction for IO6.
4.
According to Table 7, GPIO 222 must be set as a high-impedance input to disable the pullup resistor for
IO6.
5.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
254 > /sys/class/gpio/export
222 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
high > /sys/class/gpio/gpio254/direction
in > /sys/class/gpio/gpio222/direction
mode1 > /sys/kernel/debug/gpio_debug/gpio182/current_pinmux
high > /sys/class/gpio/gpio214/direction
You should be able to use IO6 as a PWM output. For example:
# echo 2 > /sys/class/pwm/pwmchip0/export
# echo 2000000 > /sys/class/pwm/pwmchip0/pwm2/duty_cycle
# echo 1 > /sys/class/pwm/pwmchip0/pwm2/enable
11.5
Configure IO14 as an ADC input
To configure IO14 as an ADC input, do the following:
1.
Refer to Table 2 for the GPIO number. According to Table 2, the GPIO number for IO14 is 44.
2.
According to Table 4, GPIO 200 must be set to 1 to select ADC.
3.
According to Table 7, GPIO 232 must be set to 0 to disable the output direction for IO14.
4.
Any GPIO lines directly connected to IO14 should be configured as high-impedance inputs to prevent
possible current leakage. According to Table 7, GPIO 208 is used to enable a pullup resistor for IO14.
5.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
200 > /sys/class/gpio/export
232 > /sys/class/gpio/export
208 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
high > /sys/class/gpio/gpio200/direction
low > /sys/class/gpio/gpio232/direction
in > /sys/class/gpio/gpio208/direction
high > /sys/class/gpio/gpio214/direction
You should be able to use IO14 as an ADC input. For example:
# cat /sys/bus/iio/devices/iio:device1/in_voltage0_raw
Note:
The default state of the mux switches and level-shifters for shield pins IO11 to 13 is inconsistent, and will
impair SPI communication to the ADC if not configured properly. Thus, we recommend following the
instructions elsewhere in this document to fully configure these pins for any of their functions (for
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Document Number: 331191-007
Shield pin configuration
example, SPI or GPIO) before attempting to use the ADC.
11.6
Configure IO18/IO19 for I2C connectivity
To configure IO18 and IO19 for I2C connectivity, do the following:
1.
Refer to Table 2 for the GPIO numbers. According to Table 2, the GPIO numbers for IO18 and IO19 are 28
and 27, respectively.
2.
According to Table 4, GPIO 204 must be set to 1 to select GPIO/I2C, and GPIO 28 pin-mux must be set to
‘mode1’ to select I2C for IO18.
3.
According to Table 4, GPIO 205 must be set to 1 to select GPIO/I2C, and GPIO 27 pin-mux must be set to
‘mode1’ to select I2C for IO19.
4.
GPIO 14 and GPIO 165 are also connected to the I2C signals, and should be configured as highimpedance inputs when I2C is in use on these pins, to prevent them driving a signal on the I2C bus.
5.
According to Table 7, GPIO 236 must be set to 0 to disable the output direction for GPIO 14, and GPIO 237
must be set to 0 to disable the output direction for GPIO 165.
6.
According to Table 7, GPIO 212 and 213 must be set as high-impedance inputs to disable the pullup
resistors for IO18 and IO19, respectively.
7.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
28 > /sys/class/gpio/export
27 > /sys/class/gpio/export
204 > /sys/class/gpio/export
205 > /sys/class/gpio/export
236 > /sys/class/gpio/export
237 > /sys/class/gpio/export
14 > /sys/class/gpio/export
165 > /sys/class/gpio/export
212 > /sys/class/gpio/export
213 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
high > /sys/class/gpio/gpio204/direction
high > /sys/class/gpio/gpio205/direction
in > /sys/class/gpio/gpio14/direction
in > /sys/class/gpio/gpio165/direction
low > /sys/class/gpio/gpio236/direction
low > /sys/class/gpio/gpio237/direction
in > /sys/class/gpio/gpio212/direction
in > /sys/class/gpio/gpio213/direction
mode1 > /sys/kernel/debug/gpio_debug/gpio28/current_pinmux
mode1 > /sys/kernel/debug/gpio_debug/gpio27/current_pinmux
high > /sys/class/gpio/gpio214/direction
You should be able to use IO18 and IO19 for I2C communication.
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Document Number: 331191-007
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Hardware Guide
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Shield pin configuration
11.7
Configure IO10 through IO13 for SPI connectivity
To configure IO10 through IO13 for SPI connectivity, do the following:
1.
Refer to Table 2 for the GPIO numbers. According to Table 2, the GPIO numbers for IO10 through IO13 are
111, 115, 114, and 109, respectively.
2.
According to Table 4, GPIO 263 must be set to 1 to select GPIO/SPI, GPIO 240 must be set to 1 to select
SPI, and GPIO 111 pin-mux must be set to ‘mode1’ to select SPI for IO10.
3.
According to Table 4, GPIO 262 must be set to 1 to select GPIO/SPI, GPIO 241 must be set to 1 to select
SPI, and GPIO 115 pin-mux must be set to ‘mode1’ to select SPI for IO11.
4.
According to Table 4, GPIO 242 must be set to 1 to select SPI, and GPIO 114 pin-mux must be set to
‘mode1’ to select SPI for IO12.
5.
According to Table 4, GPIO 243 must be set to 1 to select SPI, and GPIO 109 pin-mux must be set to
‘mode1’ to select SPI for IO13.
6.
According to Table 7, GPIO 258 must be set to 1 to enable the output direction for IO10, GPIO 259 must
be set to 1 to enable the output direction for IO11, GPIO 260 must be set to 0 to disable the output
direction for IO12, and GPIO 261 must be set to 1 to enable the output direction for IO13.
7.
According to Table 7, GPIOs 226 through 229 must be set as high-impedance inputs to disable the pullup
resistors for IO10 through IO13.
8.
According to Table 6, the TRI_STATE_ALL signal is controlled by GPIO 214.
9.
After you have gathered all of this information, enter the following commands in Linux:
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
echo
111 > /sys/class/gpio/export
115 > /sys/class/gpio/export
114 > /sys/class/gpio/export
109 > /sys/class/gpio/export
263 > /sys/class/gpio/export
240 > /sys/class/gpio/export
262 > /sys/class/gpio/export
241 > /sys/class/gpio/export
242 > /sys/class/gpio/export
243 > /sys/class/gpio/export
258 > /sys/class/gpio/export
259 > /sys/class/gpio/export
260 > /sys/class/gpio/export
261 > /sys/class/gpio/export
226 > /sys/class/gpio/export
227 > /sys/class/gpio/export
228 > /sys/class/gpio/export
229 > /sys/class/gpio/export
214 > /sys/class/gpio/export
low > /sys/class/gpio/gpio214/direction
high > /sys/class/gpio/gpio263/direction
high > /sys/class/gpio/gpio240/direction
high > /sys/class/gpio/gpio262/direction
high > /sys/class/gpio/gpio241/direction
high > /sys/class/gpio/gpio242/direction
high > /sys/class/gpio/gpio243/direction
high > /sys/class/gpio/gpio258/direction
high > /sys/class/gpio/gpio259/direction
low > /sys/class/gpio/gpio260/direction
high > /sys/class/gpio/gpio261/direction
in > /sys/class/gpio/gpio226/direction
in > /sys/class/gpio/gpio227/direction
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Hardware Guide
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February 2015
Document Number: 331191-007
Shield pin configuration
#
#
#
#
#
#
#
echo
echo
echo
echo
echo
echo
echo
in > /sys/class/gpio/gpio228/direction
in > /sys/class/gpio/gpio229/direction
mode1 > /sys/kernel/debug/gpio_debug/gpio111/current_pinmux
mode1 > /sys/kernel/debug/gpio_debug/gpio115/current_pinmux
mode1 > /sys/kernel/debug/gpio_debug/gpio114/current_pinmux
mode1 > /sys/kernel/debug/gpio_debug/gpio109/current_pinmux
high > /sys/class/gpio/gpio214/direction
You should be able to use IO10 through IO13 for SPI connectivity.
§
February 2015
Document Number: 331191-007
Intel® Edison Kit for Arduino*
Hardware Guide
31